Anthraquinones chrysazine

Anthraquinones The Oj Pile). Alizarin (1,2-dihydroxyanthraquinone) is the orange-red compound of Rubia tinctorum (madder) (Rubiaceae), a longstanding dyestuff in human history. A range of anthraquinones are variously cathartic, antimicrobial and cytotoxic. A variety of anthraquinones are protein kinase inhibitors including alizarin, chrysazin, damnacanthal, emodin and purpurin. 

Chrysazin (= Danthron Dantron 1,8-dihydroxy-9,10-anthraquinone) (anthraquinone)... 

Chrysazin (= Dantron Danthron 1,8-Dihydroxy-9,10-anthracenedione) (anthraquinone) Elemicin (phenylpropene)... 

The same strongly colored compounds (quinizarine, chrysazine) have been identified, together with anthraquinone in the final products of insolation of anthracene, adsorbed on active alumina of different previous treatment (119). On zinc oxide only anthraquinone was formed. Naphthalene produced naphthaquinone. 

Liebermann discovered the reaction between nitrous acid and phenols and secondary amines named after him. He prepared amino-naphthols from nitro-naphthols, synthesised the dihydroxyanthraquinones anthrarufin and chrysazin, and studied the reduction of anthraquinone. Another dihydroxy-anthraquinone, quinizarin, was discovered by F. Grimm by heating hydro-quinone with phthalic anhydride. 

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